Solid wood used as a fuel for heating. See log. The energy density of firewood is about 5 kilowatt-hours (kWh) per oven-dry kg for non-resinous wood and 6 kWh per oven-dry kg for resinous wood. Bark and branchwood have relatively high energy densities.

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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